*{
    margin: 0;
    padding: 0;
}
li{
    list-style: none;
}
.wrap{
    width: 1300px;
    margin: 0 auto;
    background-color: rgb(225, 207, 183);
}
.content-wrap{
    width: 100%;
    margin-top: 600px;
    margin-bottom: 600px;
    background-color: aqua;
}
.content-wrap .content{
    width: 100%;
    height: 400px;
    margin-top: 10px;
    text-align: center;
    /* 新属性：垂直排列 */
    align-content: center;
    font-size: 50px;
}
.content-wrap .content:nth-child(1){
    background-color: red;
}
.content-wrap .content:nth-child(2){
    background-color: green;
}
.content-wrap .content:nth-child(3){
    background-color: rgb(210, 114, 202);
}
.fixedtool-wrap{
    position: fixed;
    top: 400px;
    left: 30px;
    background-color: #ccc;
    display: none;
}
.fixedtool>ul>li{
    padding: 10px 10px;
    font-size: 20px;
    color: green;
}
.fixedtool>ul>li:hover{
    cursor: pointer;
}
.click-fixedtool{
    background-color: aqua;
    color: #fff;
}